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The coach was returning from Ex Normandy Scholar, a military history field trip which the Cadets do in their second term.

Defence sources said: 'There were three stowaways, two were grabbed as they got off the coach via the baggage compartment and one legged it into the grounds and is still on the loose.'

The embarrassing episode has echoes of a similar incident in 2009 when an illegal immigrant from Afghanistan got inside Sandhurst after hiding in a coach bringing Army officers back from the Continent.

The incident will raise serious security questions at the army college in Surrey (pictured)

That bus had been travelling from 28 Engineer Regiment's base in Hameln, Germany, making a brief stop in Belgium before heading on to France to cross the Channel.

The 20-year-old Afghan man was only discovered once the vehicle was inside Sandhurst when a corporal and lance corporal saw him hiding as they got off.

He had already managed to get past border control in Dover while he was concealed on the coach before slipping through security there.

The nationality of yesterday's stowaway is not known, although sources said the coach will have travelled via Calais.

Prince Harry graduated at the army college in Camberley, Surrey, as an officer

It comes just weeks after a van driver was killed following an accident caused by a makeshift barricade built by UK-bound migrants on a motorway near the French port.

The horrifying collision killed the man instantly as his Polish-registered Renault Master caught fire on the A16 motorway.

Detectives believe that the Eritreans blockaded the road so as to get on board lorries heading for the south coast of England.

Reinforcements including at least 150 riot control officers were drafted into Calais earlier this month as the problem of UK-bound migrants setting up burning roadblocks worsened.

It is all part of a deteriorating security situation in the French port town that has also seen soldiers and specialist anti-terrorism teams drafted in.

It was in October last year that some 8000 would-be asylum seekers were 'evacuated' from Calais following the destruction of the so-called 'Jungle' shanty town.

Last night an Army Spokesman said: 'We are aware of an incident at RMA Sandhurst this afternoon, which was rapidly dealt with in conjunction with Thames Valley Police.

'It would be inappropriate to comment further at this time and enquiries should be referred to Thames Valley Police.'